IBM Tivoli Storage Manager for UNIX and Linux Backup-Archive ...

Utilizing image backup to perform file system incrementalbackupThere are two methods of utilizing image backups to perform efficient incrementalbackups of your file system. These backup methods allow you to performpoint-in-time restore of your file systems and improve backup and restoreperformance. You can perform the backup only on formatted volumes; not on rawlogical volumes. You can either use image backup with file system incremental or youcan use image backup with image incremental mode to perform image backups ofvolumes with mounted file systems.The following are some examples of using image backup with file system incremental.v To perform a full incremental backup of the file system: dsmc incremental/myfilesystemv To perform an image backup of the same file system: dsmc backup image/myfilesystemv To periodically perform incremental backups: dsmc incremental /myfilesystemYou must follow the next steps in the order shown to ensure that the serverrecords additions and deletions accurately.Use this command to restore the file system to its exact state as of the lastincremental backup: dsmc restore image /myfilesystem -incremental-deletefiles.During the restore, the client does the following:v Restores the most recent image on the server.v Deletes all of the files restored in the previous step which are inactive on theserver. These are files which existed at the time of the image backup, but weresubsequently deleted and recorded by a later incremental backup.v Restores new and changed files from the incremental backups.If you do not follow the steps exactly, two things can occur:1. After the original image is restored, all files backed up with the incrementalcommand are restored individually.2. If you perform a backup image before performing an incremental, files deletedfrom the original image are not deleted from the final restored file system.The following are some examples of using image backup with image incremental mode.v To perform an image backup of the same file system: dsmc backup image/myfilesystemv To perform an incremental image backup of the file system: dsmc backup image/myfilesystem -mode=incrementalThis sends only those files that were added or changed since the last imagebackup to the server.v To periodically perform full image backups: dsmc backup image /myfilesystemv To restore the image: dsmc restore image /myfilesystem -incrementalOn restore, Tivoli Storage Manager ignores the deletefiles option when theimage+image incremental technique of backing up has been used. The restorewill include files that were deleted after the last full image backup plus thelatest versions of files added or changed after the last image backup.452 IBM Tivoli Storage Manager for UNIX and Linux Backup-Archive Clients Version 6.1: Installation and User’s Guide